Is it practical to attempt to build a 3D hologram generator that is full color and big enough to recreate a watermelon full size? If so, is real-time control feasible?
closed as off topic by David Z♦ Mar 27 '13 at 16:35
Questions on Physics Stack Exchange are expected to relate to physics within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.
Based on my one day lab practice experience, I will cover the general part of your question.
Color of hologram
Compared to a conventional photo a hologram additionaly saves phase (of light wave) information. Depending on the viewport the wave reconstruction allows the observer the experience color 3D pictures. However this reconstruction has a flaw: the color changes like a rainbow (color hologram on wiki) as can be seen in holograms on a credit card. Holograms demand the same wavelength for reconstruction than creation. I do not know whether there is a procedure to capture real color holograms using 3 capturing wavelengths, better than the above shown mice from wiki.
Cost of elements for a holographic recorder
Cost of elements for a hologram recorder: Using laser of long coherence length(depth of focus), stable mechanics and environment, beam splitter, beam expander, a photobox full o sand and holographic recording media, this is easiliy done below 30k dollar. Scale this up from my $5\cdot5\,$cm$^2$ using stronger beam expander. Your answer is yes but the question of the quality of the hologram remains. A proof is the initial linked picuture of a mice, that is small compared to a water melon.